Electron microscope study on the new phases of BaMnO3−x substituted for Mn sites by some cations
Electron microscope study on the new phases of BaMnO3−x substituted for Mn sites by some cations
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BaMnO3−x 新相被某些阳离子取代 Mn 位点的电子显微镜研究
DOI：
10.1016/0022-4596(87)90226-x
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发表时间：
1987
期刊：
影响因子：
--
通讯作者：
H. Shibahara
中科院分区：
文献类型：
--
作者：
H. Shibahara
通过高分辨电子显微镜研究了由式BaMn1−xMxO3（M=金属离子）表示的新相的结构。BaMn1− xMxO3是由M离子（M= Ta和Zn离子）取代Mn离子而形成的。电子显微镜图像显示，在BaMnO3− x系统中，Mn离子的阳离子取代引起了2H相向其他相的相变，这些相的周期比2H长。在Ta离子替代的情况下，结构图像表明，2层相的结构转变为对应于15层相的修改结构，伴随着垂直于六方晶格中的轴的剪切。这些结果支持了作者及其同事先前在电子显微镜中电子束辐照引起BaMnO 3 − x系统相变的情况下提出的机制。
Structures of new phases represented by the formula BaMn1−xMxO3(M= metal ion) were studied by high-resolution electron microscopy. BaMn1−xMxO3was formed by substitutingMcations (M= Ta and Zn ions) for Mn ions. Electron microscope images showed that cation substitution for Mn ions in the BaMnO3−xsystem induced a phase transformation for the 2H phase into other phases with a longer periodicity than that of 2H. In the case of Ta ion substitution, the structure images showed that the structure of the 2-layer phase was transformed into a modified structure corresponding to a 15-layer phase accompanied by a shear normal to thecaxis in hexagonal lattice. These results support the mechanism which was previously suggested by the present author and his colleague in the case of the phase transformation of the BaMnO3−xsystem caused by the electron beam irradiation in electron microscopy.